US5547356A - Gear pump and method of using same - Google Patents

Gear pump and method of using same Download PDF

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Publication number
US5547356A
US5547356A US08/417,853 US41785395A US5547356A US 5547356 A US5547356 A US 5547356A US 41785395 A US41785395 A US 41785395A US 5547356 A US5547356 A US 5547356A
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US
United States
Prior art keywords
gear pump
recess
pump according
recesses
meshing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US08/417,853
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English (en)
Inventor
Roger Stehr
Peter Blume
Marco Benetti
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Maag Pump Systems AG
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Maag Pump Systems AG
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Filing date
Publication date
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Application filed by Maag Pump Systems AG filed Critical Maag Pump Systems AG
Assigned to MAAG PUMP SYSTEMS AG reassignment MAAG PUMP SYSTEMS AG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BENETTI, MARCO, BLUME, PETER, STEHR, ROGER
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C13/00—Adaptations of machines or pumps for special use, e.g. for extremely high pressures
    • F04C13/001—Pumps for particular liquids
    • F04C13/002—Pumps for particular liquids for homogeneous viscous liquids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/082—Details specially related to intermeshing engagement type machines or pumps
    • F04C2/088—Elements in the toothed wheels or the carter for relieving the pressure of fluid imprisoned in the zones of engagement

Definitions

  • the present invention relates to a gear pump and method of using same, which gear pump has at least two rotors which mesh in an externally toothed manner in a product duct.
  • EP-A-0 559 582 U.S. Pat. No. 5,190,450
  • a volume-enlarging relief recess is provided on the delivery side of the product duct.
  • a gear pump of the initially mentioned type is known from European Patent Document EP-0 455 059 and German Patent Document DE-366 152.
  • volume-enlarging recesses are molded into the product duct wall in the meshing area of the rotors by means of which the resulting pressure peaks are reduced.
  • the recesses have bent profiles. This has the result that the material to be conveyed accumulates in the recesses. The accumulations, which are subjected there to long-term thermal stress, may become detached in an uncontrolled manner and contaminate the conveyed material and are also difficult to access when the pump is cleaned.
  • This object is achieved according to preferred embodiments of the present invention by providing at least one volume enlarging recess in the product duct wall, which recess is formed with a continuously curved surface.
  • Certain preferred embodiments of the gear pump according to the invention include one recess respectively provided on both sides of the product duct in the direction of a plane connecting the rotor axis.
  • At least one recess respectively is provided on the delivery and suction side of the area of the meshing of the rotors.
  • the at least one recess is formed as a spherical surface segment.
  • the rotors are disposed in product lubricated slide bearings and is/are molded at least partially into the face of a slide bearing body forming a part of the product duct wall.
  • very sensitive and/or heat sensitive media is pumped.
  • food or polymer meltings such as PVC, caoutchouc or biopolymers is pumped.
  • FIG. 1 is a perspective sectional view of a portion of a gear pump according to the invention, the sectional plane being located in the axis of the product duct and in parallel to the axes of the rotors;
  • FIG. 2 is a schematic view of the gear pump of FIG. 1.
  • FIG. 1 is a sectional view of the product duct 1, along its axis A and in parallel to the axis B of one of the two provided rotors which are not shown in this FIG. 2 and mesh in an externally toothed manner.
  • FIG. 2 schematically depicts the gear pump and rotor.
  • the meshing area of the rotors is situated essentially in the sectional plane E of the selected representation. Furthermore, it is symmetrical with respect to a plane through the axis B and the axis, which is not shown here, of the second rotor which is situated above it in the selected representation.
  • one volume-enlarging recess 6a 1 , 6b 1 is molded into the product duct wall 3 on the inlet side, as shown to face the inlet duct portion 1a. Also on the outlet side, that is, facing the outlet duct portion 1b, volume enlarging recesses 6a 2 , 6b 2 are molded into the product duct wall 3 of the product duct 1, these recesses being situated opposite one another on both sides of the location where the rotors mesh in the product duct 1.
  • the conveyed medium can be relieved from pressure into the provided recesses 6 (6a 1 , 6a 2 , 6b, 6b 2 ), which prevents the formation of high squeeze pressure peaks and achieves, on the duct inlet side, an improvement of the filling behavior of the tooth spaces.
  • the recesses 6a, b are arranged in pairs symmetrically with respect to the plane E B which extends through the two axes B of the rotor shafts.
  • bearing bodies 7 are provided in the pump housing as indicated by a broken line with respect to one bearing journal.
  • the recesses 6 according to the invention are then constructed as continuously changing from the wall area of the product duct defined by the pump housing into the wall area of the mentioned duct defined by the face of the bearing body 7.
  • the recesses provided according to especially preferred embodiments of the invention extend in an exactly identical manner in the upper, cut-away half of the product duct.
  • the recesses 6a 1 and 6a 2 , 6b 1 and 6b 2 are worked in (molded or formed into the product duct wall) such that they each have the shape of a spherical segment.
  • the recesses, each in pairs define calotte shells or, more generally, continuously curved spatial surfaces. This ensures that no clearance spaces are created by means of the recesses provided according to the invention.
  • Deviations may take place from ideal ellipsoid or spherical-segment-shaped recesses and basically recesses may be provided which have continuously curved recess surfaces according to other contemplated preferred embodiments of the invention.
  • a gear pump according to the invention is excellently suitable for the delivery of media which are sensitive to shear and/or heat, particularly polymer meltings, such as PVC, caoutchouc or biopolymers. However, it is also suitable for the conveying of food where, with respect to the absence of clearance spaces, the requirements are similar to those of the above-mentioned meltings.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
US08/417,853 1994-04-07 1995-04-07 Gear pump and method of using same Expired - Fee Related US5547356A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP94105347A EP0677660B1 (de) 1994-04-07 1994-04-07 Zahnradpumpe und deren Verwendung
EP94105347 1994-04-07

Publications (1)

Publication Number Publication Date
US5547356A true US5547356A (en) 1996-08-20

Family

ID=8215838

Family Applications (1)

Application Number Title Priority Date Filing Date
US08/417,853 Expired - Fee Related US5547356A (en) 1994-04-07 1995-04-07 Gear pump and method of using same

Country Status (7)

Country Link
US (1) US5547356A (da)
EP (1) EP0677660B1 (da)
JP (1) JPH07279861A (da)
AT (1) ATE138159T1 (da)
DE (1) DE59400284D1 (da)
DK (1) DK0677660T3 (da)
ES (1) ES2087780T3 (da)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6179594B1 (en) 1999-05-03 2001-01-30 Dynisco, Inc. Air-cooled shaft seal
US6210139B1 (en) * 1998-10-01 2001-04-03 The Dow Chemical Company High efficiency gear pump for pumping highly viscous fluids
US6213745B1 (en) 1999-05-03 2001-04-10 Dynisco High-pressure, self-lubricating journal bearings

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE138159T1 (de) * 1994-04-07 1996-06-15 Maag Pump Systems Ag Zahnradpumpe und deren verwendung
DE10135709C1 (de) * 2001-07-21 2003-02-13 Hartmut Hasse Universelle zwangsgeschmierte Gleitlagerung für eine Zahnradpumpe

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE366152C (de) * 1922-12-30 Bbc Brown Boveri & Cie Einrichtung zur Vermeidung der Quetschwirkung bei Zahnrad-OElpumpen
US3113524A (en) * 1961-12-26 1963-12-10 Roper Hydraulics Inc Gear pump with trapping reliefs
US3303792A (en) * 1964-04-20 1967-02-14 Roper Ind Inc Gear pump with trapping reliefs
US4017224A (en) * 1975-03-11 1977-04-12 Robert Bosch G.M.B.H. Gear machine with cutouts in the shaft journals
GB8500273D0 (en) 1985-01-05 1985-02-13 Hepworth Plastics Ltd Gear pumps
US4737087A (en) * 1984-12-10 1988-04-12 Barmag Ag Drive shaft seal for gear pump and method
EP0455059A1 (en) * 1990-04-26 1991-11-06 FIATGEOTECH - TECNOLOGIE PER LA TERRA S.p.A. Gear pump
US5190450A (en) * 1992-03-06 1993-03-02 Eastman Kodak Company Gear pump for high viscosity materials
EP0677660A1 (de) * 1994-04-07 1995-10-18 Maag Pump Systems AG Zahnradpumpe und deren Verwendung

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE366152C (de) * 1922-12-30 Bbc Brown Boveri & Cie Einrichtung zur Vermeidung der Quetschwirkung bei Zahnrad-OElpumpen
US3113524A (en) * 1961-12-26 1963-12-10 Roper Hydraulics Inc Gear pump with trapping reliefs
US3303792A (en) * 1964-04-20 1967-02-14 Roper Ind Inc Gear pump with trapping reliefs
US4017224A (en) * 1975-03-11 1977-04-12 Robert Bosch G.M.B.H. Gear machine with cutouts in the shaft journals
US4737087A (en) * 1984-12-10 1988-04-12 Barmag Ag Drive shaft seal for gear pump and method
GB8500273D0 (en) 1985-01-05 1985-02-13 Hepworth Plastics Ltd Gear pumps
GB2169350A (en) * 1985-01-05 1986-07-09 Hepworth Plastics Ltd Gear pumps
EP0189670A1 (en) * 1985-01-05 1986-08-06 Maag Pump Systems AG Gear pumps
EP0455059A1 (en) * 1990-04-26 1991-11-06 FIATGEOTECH - TECNOLOGIE PER LA TERRA S.p.A. Gear pump
US5190450A (en) * 1992-03-06 1993-03-02 Eastman Kodak Company Gear pump for high viscosity materials
EP0559582A1 (en) * 1992-03-06 1993-09-08 Eastman Kodak Company Gear pump for high viscosity materials
EP0677660A1 (de) * 1994-04-07 1995-10-18 Maag Pump Systems AG Zahnradpumpe und deren Verwendung

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6210139B1 (en) * 1998-10-01 2001-04-03 The Dow Chemical Company High efficiency gear pump for pumping highly viscous fluids
US6179594B1 (en) 1999-05-03 2001-01-30 Dynisco, Inc. Air-cooled shaft seal
US6213745B1 (en) 1999-05-03 2001-04-10 Dynisco High-pressure, self-lubricating journal bearings
US6264447B1 (en) 1999-05-03 2001-07-24 Dynisco Air-cooled shaft seal

Also Published As

Publication number Publication date
ES2087780T3 (es) 1996-07-16
EP0677660B1 (de) 1996-05-15
DK0677660T3 (da) 1996-06-03
DE59400284D1 (de) 1996-06-20
JPH07279861A (ja) 1995-10-27
ATE138159T1 (de) 1996-06-15
EP0677660A1 (de) 1995-10-18

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AS Assignment

Owner name: MAAG PUMP SYSTEMS AG, SWITZERLAND

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:STEHR, ROGER;BLUME, PETER;BENETTI, MARCO;REEL/FRAME:007539/0205

Effective date: 19950413

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Year of fee payment: 4

FPAY Fee payment

Year of fee payment: 8

REMI Maintenance fee reminder mailed
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STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362

FP Lapsed due to failure to pay maintenance fee

Effective date: 20080820